Oxidative Photocatalytic Homo- and Cross-Coupling of Phenols: Nonenzymatic, Catalytic Method for Coupling Tyrosine
作者:Kyle A. Niederer、Philip H. Gilmartin、Marisa C. Kozlowski
DOI:10.1021/acscatal.0c04515
日期:2020.12.18
An oxidative photocatalytic method for phenol–phenol homo- and cross-coupling is described, and isolated yields of 16–97% are obtained. Measured oxidation potentials and computed nucleophilicity parameters support a mechanism of nucleophilic attack of one partner onto the oxidized neutral radical form of the other partner. Our understanding of this model permitted the development of cross-coupling reactions
Several phosphine and phosphite ligands were tested in the hydroformylation of 4-pentenal to adipic aldehyde, a versatile starting material for industrially very relevant compounds. By varying the ligand structure we were able to increase the selectivity toward alipic aldehyde to >95%. Additionally, two molecular structures of important catalytic intermediates [(bisphosphite)RhH(CO)(2)] and one structure of a previously unknown catalyst decomposition product were obtained.
Host-guest complexation. 25. Effects of substituents on the complexing properties of chorands
作者:Thomas W. Bell、George M. Lein、Hideo Nakamura、Donald J. Cram
DOI:10.1021/jo00172a053
日期:1983.12
Verfahren zur Herstellung von 2,2'-Dihydroxybiphenyl-Verbindungen